102020105081 has 2 divisors, whose sum is σ = 102020105082. Its totient is φ = 102020105080.

The previous prime is 102020105063. The next prime is 102020105141. The reversal of 102020105081 is 180501020201.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 63332755600 + 38687349481 = 251660^2 + 196691^2 .

It is an emirp because it is prime and its reverse (180501020201) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 102020105081 - 2²⁶ = 101952996217 is a prime.

It is a super-2 number, since 2×102020105081² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (102020105021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51010052540 + 51010052541.

It is an arithmetic number, because the mean of its divisors is an integer number (51010052541).

Almost surely, 2^102020105081 is an apocalyptic number.

It is an amenable number.

102020105081 is a deficient number, since it is larger than the sum of its proper divisors (1).

102020105081 is an equidigital number, since it uses as much as digits as its factorization.

102020105081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 160, while the sum is 20.

Adding to 102020105081 its reverse (180501020201), we get a palindrome (282521125282).

The spelling of 102020105081 in words is "one hundred two billion, twenty million, one hundred five thousand, eighty-one".